This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 480 |
| 2 | 123840 |
| 3 | 3150720 |
| 4 | 31704960 |
| 5 | 187502400 |
| 6 | 812885760 |
| 7 | 2767107840 |
| 8 | 8116473600 |
| 9 | 20671878240 |
| 10 | 48375619200 |
| 11 | 102892268160 |
| 12 | 208111357440 |
| 13 | 391550752320 |
| 14 | 713913822720 |
| 15 | 1230765753600 |
| 16 | 2077817249280 |
| 17 | 3348363579840 |
| 18 | 5333344585920 |
| 19 | 8152110268800 |
| 20 | 12384908524800 |